r_rootlod
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r_rootlod is a console variable available in all 
Source games. It offsets the root level of detail, which normally would be 0.
Usage
Syntax: r_rootlod <integer>
The default value is "0". Acceptable range is from 0 to the engine limit. In 
Half-Life 2 the limit is 7.
A models root level of detail, also known as LOD 0 or the base level, is the fully detailed version of a model, containing all polygons.
r_rootlod forces the engine to treat the base level as a different value.
Setting r_rootlod to 1 means all models will never go down below 1 (as 1 is classified as the root now, instead of 0), but it still allows the engine to dynamically adjust level of detail, unlike r_lod.